code: def normalize(request):
      """Boolean flag for normalize"""
      return request.param
  
file_path: dask-ml/tests/metrics/test_classification.py
imports: import numbers
  import dask.array
  import numpy
  import pytest
  import sklearn.metrics
  import dask_ml.metrics
label_desc: Use image node_id 2 for calling a global function with example usage: normalize(request) and returns: request